Telegraphic transmission.



a. scuou. TELEGRAPH! TRANSMISSION. APPLICATION HLED JAN. 12, 1914.

150,395; Patenfed Aug. 17, 1915.

l l inesses I [kl/16501 544/ jefia a UNITED STATES PATENT OFFICE.

CARL SCHO 'U, 0F HOLTE, DENMARK.

TELEGRAPI-IIC TRANSMISSION.

Specification of Letters Patent.

Patented Aug. 17, 1915.

application filed January 12, 1914. Serial No. 811,725.

To all whom it may concern Be it known that I, CARL Sonoo; a subject of the King of Denmark, residing at Holte, Denmark, have invented certain new and useful Improvements in and Relating duce the injurious effect (if sparking which the closing and interrupting of the telegraphic currents effect on the contact parts controlling the signaling.

According to the present invention there is provided at least two sets of contact apparatus,-each' consisting of two contact places arranged in parallel, one of which is actu ated by means of a perforated paper slip or the like, and is closed and interrupted in ac- 7 cordance with the signals, whereas the other contact place efi'ects the closing and interrupting of the currents care being taken that the former contact place is closed and interrupted, or in any case interrupted, at such moments when the latter contact place is closed. Sparking is thereby avoided at the former contact place. The latter cont'act place must be constructed in such a manner that it can stand the formation of sparks. Closing and interrupting of the latter contact place is effected periodically and for this purpose rotating drums or rollers with slip springs may be employed.

An embodiment of the intention is diagrammatically illustrated on the accompanying drawing.

The telegraph current is led in through the wire a and out through the wire I).

c is a rotating disk of insulating material partof its circumference being provided with a segment (i of metal, reaching over somewhat less than half of the circumference. Two sets of contact springs e, f and are adapted to engage the circumfen ence of the disk and these springs are electrically connected in pairs when they are on; the segment (Z, which is of such a length that a connection between the springs it and (2 cannot be established. The contact springs f and g are connected by means of a wire as shown.

In parallel with the contact place formed by the springs e and f is a contact place is, and in parallel with the contact place formed by the springs g and h is another contact place m. The contact places is and m are actuated in accordance with the naling, and in'such a manner that the clos ing and interrupting of the said contact places always take place at such moments the contact springs in question e, f or g, i: are electrically connected by means of the segment d. The contact places k and m are controlled most appropriately by means of? a perforated paperslip mechanically actu ated by means of the shaft of the disk 0, is

order to secure that the above condition as tr we rupted by atleast one set of the contact springs e, f or g, k. If the contact place on be closed when the parts occupy the position shown in the drawing, this is of no consequence to' the passage of the current; if, however, the segment d cozmect the contact springs e and f, the current will flow from a to 1) during the time, that the segment 0) requires to pass the said contact springs. A dot in the Morse system for instance, will therefore be transmitted. Transmission .01 a dash is effected through three consecutive contact closings, for example first at the contact place 772, then at. the contact place is and then again at the contact place m. The

contact making elements connected in series,

means for conductively connecting and disconnecting the some, whereby contact between at least one pair of the sold elements and permanently in multiple With each of the Contact places formed at the said elementsand, means for closingv and interrupting contact at the said. contact devices in am cordance with the telegraph signals at such moments in which the corresilonding contact making elements are conductivel In Witness whereef, I slgnature, 1n the presen Witnesses:

Vmeo BLOM, 011cm V. Sorrow.

%;eonnected. i0

heme su scribed my ce 0 twewitnesses.

CARL SCHOU. 

